Clamping spider



Aug. 27, 1929. M B, DAvls y 1,726,521

CLAHIING SPIDER Filed April 50, 1926 2 Sheets-Sheet 1 3W Z4 5% 4"@ 27 I ZK 1 f Z/ /6 a ,i

/ /Q 1 l MTA "'24 /7 /Nl/No/e ATTORNEY Aug. 27, 19.29. M. B. DAvls 1,726,521

CLAIIPING SPIDER A TTORNEY Patented Aug. 27, 1929. .i

UNITED STATES MARVIN B. nAvIs, or xANsAs crrY, ms l SAPULPA, o

"PATENT OFFICE.

sonar, -Assiaivon 'ro GEORGE xaELL, or xLAHoMA.

CLAMPING SPIDER.

Application filed April 30,

It is a purpose ofmy invention to provide p a device of the above mentioned character in which bell crank levers are utilized for supporting the clamping jaws, said bell crank levers being connected with a base member and with each other in such a manner that when the jaws as a whole `are moved upwardly they will separate and when the same are moved downwardly they will move toward each other to clamp a member therebetween. Thus the tendency toward downward movement of the casing or other member to be held by the aws, will tend to cause the jaws to exert a firmer grip on the member engaged thereby. The device is preferably so constructed that the same can be readily engaged around and removed from embracing relation to a casing or other member with which the same is associated.

Other objects and advantages ofthe invention will appear as the descriptionof the accompanying drawings proceeds. However, I desire to have it distinctly understood that I do not intend to limit myself to the exact details shown or described, but that I intend to include as part of my invention all such obvious changes and modifications of parts as would occur to a person skilled 1n this art and as would fall within ,the scope of the claims.

In t-he drawings Fig. 1 is a perspective view of my improved clamping spider, showing portions of a casing head associated therewith.

Fig. 2 is a view partly in plan and partly in horizontal section of my improved clamping spider, and

Fig. 3 is a vertical, sectional view thereof.

Referring in detail to the drawings My improved spider comprises a base member 10 that is provided with a U shaped opening or slot 11 so that the same can be readily engaged around a casing or tubing 12, said base member being further preferably provided with depending ears 13 having the set screws 14 for connecting the same with a flange 15 on the casing head 16. The base member is further preferably provided with pairs of upstanding ears 17 which carry 192e. serial Nn. 105,741.

the transverse shafts 18v upon which are mounted to pivot thereon the links 19. The opposite ends of the links 19, are provided with transversely extending shafts or pivot pins 20 upon which the lower ends of the bell crank levers 21 are mounted, thereby roviding a floating mounting for the lever 21 in that the lever may have both vertical and lat-eral adjustment under `the conditions presently described. The bell crank levers 21 areprovided with outwardly extending pivot projections 22 that seat within the sockets 23 provided on the links'of fixed length 24 connecting opposite pairs `of said bell crank levers. Hollow bosses 25 are provided on the links `24 at the sockets 23, through "which the screws 26 extend for securing the links 24 detachably to the'bell crank levers. The bell crank levers are further provided with transversely extending pivot members 27 yexl ltending `substantially parallel Vto the pivot members 18 and 20 and connecting the bell crank levers in pairs, the pivot members 27 being offset from the pivot projections 22 as will be clearly seen from Figs. 2 and 43..

The pivot members 27 are provided with enlargements 28 `forming bearing portions receiving thebearings 29 provided ony the jaws '30. The jaws 30 are preferably channelshaped and receive the gripping members 31 therein, the gripping members being adapted to pivot'slightly on the pivots 32 and 33 provided in the ears 34 and the detachable clips or ears 35 on thejaws30. There is preferably a pair of gripping membersor slips 31 associated with each of the jaws 30,

' as will be clear from Fig. 2. The gripping members 31 are preferably provided with `gripping teeth '36 that will hold the casing or other tubular member 12from downward movement relative to the jaws.

Mounted on one of the ears 17 is an operating lever 37, the same being pvotally 'mounted on one of the members 18 and having an upwardly extending arm 39 to which the link 40 is pivoted by means of the member 41. The link 40 is further pivotally connected with one of the links 24 by means of the pivot member 42.

In operation the weight of the tubular member 12 will tend to move the jaws as a whole downwardly, which will tend to swing the pivots 27 around the pivots 22 in a direction so that said pivots 27 move toward each other, thus causing the jaws 30 to move toward each other to more firmly grip the tubing with the gripping members 31. When it Cil is desired to release the gripping members 31 from the tubing or Vcasing 12, the lever 37 is actuated to move the arm 39 thereof in a clockwise direction, whereupon the link 40 is moved outwardly, carrying one of the links 24 and thus the entire structure including the pivot members 27 therewith, causing the members 27 to rotate around the members 22 so as to move away from each other, whereupon the jaws 30 will separate, disen- 0'aging the gripping members from the tubular member 12.

When it is desired to place the spider in position around the tubing or casing, or to remove the same therefrom, one of the links 24 is detached and the jaws 30are spread apart. The spider is placed in position by moving the same laterally around the pipe or tube through one side of the separated jaws 30 and through the open end of the U- shaped slot 1l. In removing the spider the same is again moved off the pipe or tube through the open end of the slot and between the sides of the separated jaws on that side of the device on which the open end of the slot lies. j

What I claim and desire to secure by Letters Patent is 1. A device of the character described comprising a base, spaced link mountings on said base, links pivotally suspended from said mountings, crank levers pivotally mounted on said links, jaws pivotally mounted on said crank levers, and a rigid link pivotally connected with the crank levers for the respective jaws on axes eccentric to those of the jaw mountings and connecting the jaws to effect closure of the jaws when the jaws are moved transversely of the link inone direction.

2. A device of the character described comprising a base, spaced link mountings on said base, links pivotally suspended from said mountings, crank levers pivotally mounted on lsaid links, jawstpivotally mounted on said crank levers, a rigid link pivotally connected with the crank levers for the respective jaws.

on axes eccentric to those of thejaw mountings yand connecting the jaws to effect closure clamped and having a pair of upstanding i ears ateach side of the slot, a shaft carried by each pair of ears, apair of links pivotally suspended from each shaft, a pin carried by each pair of links, a pair of crank levers carried by each of said pins, opposed jaws pivotally mounted on respective pairs of crank levers, and rigid links at opposite sides of the jaws, pivot-ally connected with opposed jaw levers on axes eccentric to those of the jaw mountings, whereby movement of the jaws transversely of the connecting links in one direction will tend to shift thel ylevers and their mountings and close the jaws.

4. In a device of the character described, a base, slotted tok receive an object to be clamped and having a pair of upstanding ears at each side of the slot, a shaft carried by each pair of ears, a pair of links pivotally suspended from each shaft, a pin carried by each pair of links, a pair of crank levers carried by each of said pins, opposed jaws pivotally mounted on respective pairs of crank levers, rigid links at oppositesides ofthe jaws, pivotally connected with opposed-jaw crank levers on axes eccentric to those of the jaw mountings, whereby movement of the jaws transversely of the connecting links in one direction will tend to shift the crank levers and their mountings and close the jaws, and an operating lever on said base flexibly connected with one of said connecting links for moving the jaw in the opposite direction to open the jaws.

In testimony whereof I affix my signature.

MARVIN B. DAVIS. 

